Schreuders, T. A. R. (2011-12-14). "The quadriga phenomenon: a review and clinical relevance". Journal of Hand Surgery (European Volume). 37 (6): 513–522. doi:10.1177/1753193411430810. PMID22170246.
Horton, T; Sauerland, S; Davis, T (April 2007). "The effect of flexor digitorum profundus quadriga on grip strength". The Journal of Hand Surgery: Journal of the British Society for Surgery of the Hand. 32 (2): 130–134. doi:10.1016/j.jhsb.2006.11.005. PMID17234311.
Schreuders, T. A. R. (2011-12-14). "The quadriga phenomenon: a review and clinical relevance". Journal of Hand Surgery (European Volume). 37 (6): 513–522. doi:10.1177/1753193411430810. PMID22170246.
Horton, T; Sauerland, S; Davis, T (April 2007). "The effect of flexor digitorum profundus quadriga on grip strength". The Journal of Hand Surgery: Journal of the British Society for Surgery of the Hand. 32 (2): 130–134. doi:10.1016/j.jhsb.2006.11.005. PMID17234311.